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Pinpoint Test J: The A/C Switch Illumination Is Inoperative
Instrument Cluster and Panel Illumination
Pinpoint Tests
Pinpoint Test J: The A/C Switch Illumination Is Inoperative
Refer to Wiring Diagram Set 71, Cluster and Panel Illumination for schematic and connector information. Diagrams By Number
Normal Operation
A variable Pulse Width Modulated (PWM) voltage is supplied to the A/C switch from the instrument panel dimmer switch (part of the headlamp switch) when the side, main or parking lamps are on.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- A/C switch
PINPOINT TEST J: THE A/C SWITCH ILLUMINATION IS INOPERATIVE
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
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J1 CHECK THE A/C SWITCH ILLUMINATION VOLTAGE CIRCUIT FOR AN OPEN
- Ignition OFF.
- Disconnect: A/C Switch C2891.
- With the parking lamps on, rotate the instrument panel dimmer switch to the full illumination position.
- Measure the voltage between the A/C switch C2891-3, circuit 29S-LH53 (OG/BK), harness side and ground.
- Is the voltage greater than 10 volts?
Yes
INSTALL a new A/C switch. TEST the system for normal operation.
No
REPAIR circuit 29S-LH53 (OG/BK) for an open. TEST the system for normal operation.
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